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Balance Sheet Components - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Balance Sheet Components [Line Items]      
Depreciation and amortization expense $ 2,920,000 $ 796,000 $ 512,000
Accumulated amortization 14,155,000 11,873,000  
Amortization expense, included in depreciation and amortization expense 204,000 79,000 59,000
Laboratory, Computer, and Office Equipment [Member]      
Balance Sheet Components [Line Items]      
Assets purchased under capital leases 2,500,000 1,700,000  
Accumulated amortization 2,300,000 1,500,000  
Property, Plant & Equipment and Capital Leases [Member]      
Balance Sheet Components [Line Items]      
Depreciation and amortization expense $ 1,200,000 $ 800,000 $ 500,000